def on_connect():
"""Verifies that the user is logged in and that the app they want to monitor
exists. Joins them to a "room" for that app. Emits an event containing a
history of activity for the past 900 seconds. Starts polling for real time
stats on the app's performance.
"""
print('connecting')
app_id = request.args.get('app_id', None)
if not app_id:
print ('app_id is required')
return disconnect()
app = App.find_by_id(app_id)
if not app:
print ('app not found')
return disconnect()
print ('watching app', app_id)
sockets.join_room(get_app_room_id(app_id))
interval = request.args.get('history_interval', 900)
app_stats = AppStats.get_history(app_id, interval=interval)
socketio.emit('history', util.to_dict(app_stats),
room=request.sid, namespace=namespace)
resume_stats()
def send_stats():
"""Runs forever in a socket.io background task and sends updates on all
monitored apps. Updates are checked and sent on the configured interval
`scaling.monitor_interval`.
"""
while True:
global track_stats
if track_stats:
try:
apps = sockets.rooms_with_members('apps/')
print ('getting stats for apps', apps)
for room in apps:
app_id = room.split('/')[-1]
try:
app = App.find_by_id(app_id)
stats = app.get_current_stats(
include_instance_stats=True)
update_app_watchers(app_id, 'stats',
stats.to_dict())
except Exception as e:
import traceback
print(traceback.format_exc())
print(type(e), e.message)
except Exception as e:
print (e)
# else:
# print ('No clients active, sleeping.')
socketio.sleep(config.scaling_monitor_interval)
def wrapped_f(app_id):
app = App.find_by_id(app_id, use_cache=False)
if not app:
raise ApiError('App not found.', 404)
return func(app)